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'We heard a boom like a loud firecracker,' witness Son Nguyen told Fox7.

Mr Nguyen, who was working nearby chased after the man, but lost him. Another witness who was also working in the area Luis Urista went to Mr Reilly.

'I saw the guy was laying face down on the ground. I knew he got shot. There was some blood coming out,' Mr Urista told the news channel.

'We asked what we could do to the dispatcher to help save the guy. She said get a compress to help stop the bleeding.'

The robber enters through the front door of the store and immediately pulls a gun

Mr Reilly crouches before running at the armed robber and diving through a display

Mr Urista said a number of employees working nearby brought out towels and stayed with Mr Reilly until ambulance crews arrived. He was taken to University Medical Center Brackenridge where he remains in critical condition.

Police have said the store has been robbed two other times previously, but those crimes were not reported. They say their investigation into the shooting is ongoing and additional charges could be filed.

As he wrestles the gunman, Mr Reilly is hit by a shot in the chest but continues to struggle against the robber